It's a simple idea. Piles and piles of skeletons and bones. Create a large mound and cover it with bones (saves on how many bones you actually need). You don't even need a monster. Just leave it up to the imagination of the viewers to fill in what may have eaten all of these people.
Don't Miss a Single Mad Muttering
The best place to find current art and WIPs is Instagram
I'm also on Twitter but be prepared for political commentary